Pipeline and Hazardous Materials Safety Admin., DOT § 173.304A

Pipeline and Hazardous Materials Safety Admin., DOT § 173.304a

°C (130 °F). If the pressure exceeds 145 ance criteria in Air Transport Associa- psia at 54 °C (130 °F), a DOT 2P con- tion (ATA) Specification No. 300 for a tainer must be used. In either case, the Category I Shipping Container; metal container must be capable of (ii) Is capable of passing, as dem- withstanding, without bursting, a pres- onstrated by design testing, the Flame sure of 1.5 times the pressure of the Penetration Resistance Test in Appen- contents at 54 °C (130 °F). The liquid dix E to part 178 of this subchapter; and content of the material and gas may (iii) Prior to each shipment, passes a not completely fill the container at 54 visual inspection that verifies that all °C (130 °F). Each container filled for features of the packaging are in good shipment must have been heated until condition, including all latches, hinges, its contents reach a minimum tem- seams, and other features, and the perature of 54 °C (130 °F), without evi- packaging is free from perforations, dence of leakage, distortion, or other cracks, dents, or other abrasions that defect. Each outside shipping container may negatively affect the flame pene- must be plainly marked, ‘‘INSIDE tration resistance and thermal resist- CONTAINERS COMPLY WITH PRE- ance characteristics of the container. SCRIBED SPECIFICATIONS’’. (4) The cylinder and the outer pack- (2) [Reserved] aging must be capable of passing, as (f) A cyl- Oxidizing gases by aircraft. demonstrated by design testing, the inder containing carbon dioxide and ox- Thermal Resistance Test specified in ygen mixture, compressed; liquefied Appendix D to part 178 of this sub- gas, oxidizing, n.o.s.; or nitrous oxide is chapter. authorized for transportation by aircraft only when it meets the following (5) The cylinder and the outer pack- requirements: aging must both be marked and labeled (1) Only DOT specification 3A, 3AA, in accordance with part 172, subparts D 3AL, 3E, 3HT, and 39 cylinders, and UN and E of this subchapter. The addi- pressure receptacles ISO 9809–1, ISO tional marking ‘‘DOT31FP,’’ is allowed 9809–2, ISO 9809–3 and ISO 7866 cylinders to indicate that the cylinder and the are authorized. outer packaging are capable of passing, (2) Cylinders must be equipped with a as demonstrated by design testing, the pressure relief device in accordance Thermal Resistance Test specified in with § 173.301(f) and, for DOT 39 cyl- Appendix D to part 178 of this sub- inders offered for transportation after chapter. October 1, 2008, for the other DOT spec- (6) A cylinder of compressed oxygen ification cylinders with the first re- that has been furnished by an aircraft qualification due after October 1, 2008, operator to a passenger in accordance or for the UN pressure receptacles prior with 14 CFR 121.574, 125.219, or 135.91 is to initial use: excepted from the outer packaging re- (i) The rated burst pressure of a rup- quirements of paragraph (f)(3) of this ture disc for DOT 3A, 3AA, 3AL, 3E and section. 39 cylinders, and UN pressure recep- [67 FR 51647, Aug. 8, 2002, as amended at 68 tacles ISO 9809–1, ISO 9809–2, ISO 9809– FR 24661, May 8, 2003; 71 FR 33883, June 12, 3 and ISO 7866 cylinders must be 100% 2006; 72 FR 55098, Sept. 28, 2007; 74 FR 53188, of the cylinder minimum test pressure Oct. 16, 2009; 76 FR 56317, Sept. 13, 2011] with a tolerance of plus zero to minus 10%; and § 173.304a Additional requirements for (ii) The rated burst pressure of a rup- shipment of liquefied compressed gases in specification cylinders. ture disc for a DOT 3HT cylinder must be 90% of the cylinder minimum test (a) Detailed filling requirements. Lique- pressure with a tolerance of plus zero fied gases (except gas in solution) must to minus 10%. be offered for transportation, subject (3) The cylinder must be placed in a to the requirements in this section and rigid outer packaging that— §§ 173.301 and 173.304, in specification (i) Conforms to the requirements of cylinders, as follows: either part 178, subparts L and M, of (1) DOT 3, 3A, 3AA, 3AL, 3B, 3BN, 3E, this subchapter at the Packing Group I 4B, 4BA, 4B240ET, 4BW, 4E, 39, except or II performance level, or the perform- that no DOT 4E or 39 packaging may be

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filled and shipped with a mixture con- vision 6.1 or 2.3), unless specifically au- taining a pyrophoric liquid, carbon bi- thorized in this part. sulfide (disulfide), ethyl chloride, (2) For the gases named, the fol- ethylene oxide, nickel carbonyl, spirits lowing requirements apply (for cryo- of nitroglycerin, or toxic material (Di- genic liquids, see § 173.316):

Packaging marked as shown in this column or of Maximum permitted fill- the same type with higher service pressure must Kind of gas ing density (percent) be used, except as provided in §§ 173.301(l), (see Note 1) 173.301a(e), and 180.205(a) (see notes following table)

Anhydrous ammonia ...... 54 ...... DOT-3A480; DOT-3AA480; DOT-3A480X; DOT- 4AA480; DOT-3; DOT-3E1800; DOT-3AL480. Bromotrifluoromethane (R–13B1 or H–1301) ...... 124 ...... DOT-3A400; DOT-3AA400; DOT-3B400; DOT- 4AA480; DOT-4B400; DOT-4BA400; DOT- 4BW400; DOT-3E1800; DOT-39; DOT- 3AL400. Carbon dioxide (see Notes 4, 7, and 8) ...... 68 ...... DOT-3A1800; DOT-3AX1800; DOT-3AA1800; DOT-3AAX1800; DOT-3; DOT-3E1800; DOT- 3T1800; DOT-3HT2000; DOT-39; DOT- 3AL1800. Carbon dioxide, refrigerated liquid (see paragraph ...... DOT-4L. (e) of this section). Chlorine (see Note 2)...... 125 ...... DOT-3A480; DOT-3AA480; DOT-3; DOT- 3BN480; DOT-3E1800. Chlorodifluroethane or 1-Chloro-1, 1- 100 ...... DOT-3A150; DOT-3AA150; DOT-3B150; DOT- difluoroethane (R–142b). 4B150; DOT-4BA225; DOT-4BW225; DOT- 3E1800; DOT-39; DOT-3AL150. Chlorodifluoromethane (R–22) (see Note 8) ...... 105 ...... DOT-3A240; DOT-3AA240; DOT-3B240; DOT- 4B240; DOT-4BA240; DOT-4BW240; DOT- 4B240ET; DOT-4E240; DOT-39; DOT-3E1800; DOT-3AL240. Chloropentafluorethane (R–115) ...... 110 ...... DOT-3A225; DOT-3AA225; DOT-3B225; DOT- 4BA225; DOT-4B225; DOT-4BW225; DOT- 3E1800; DOT-39; DOT-3AL225. Chlorotrifluoromethane (R–13) (see Note 8)...... 100 ...... DOT-3A1800; DOT-3AA1800; DOT-3; DOT- 3E1800; DOT-39; DOT-3AL1800. Cyclopropane (see Note 8) ...... 55 ...... DOT-3A225; DOT-3A480X; DOT-3AA225; DOT- 3B225; DOT-4AA480; DOT4B225; DOT- 4BA225; DOT-4BW225; DOT-4B240ET; DOT- 3; DOT-3E1800; DOT-39; DOT-3AL225. Dichlorodifluoromethane (R–12) (see Note 8) ...... 119 ...... DOT-3A225; DOT-3AA225; DOT-3B225; DOT- 4B225; DOT-4BA225; DOT-4BW225; DOT- 4B240ET; DOT-4E225; DOT-39; DOT-3E1800; DOT-3AL225. Dichlorodifluoromethane and difluoroethane mix- Not liquid full at 131 °F DOT-3A240; DOT-3AA240; DOT-3B240; DOT- ture (constant boiling mixture) (R–500) (see 3E1800; DOT-4B240; DOT-4BA240; DOT- Note 8). 4BW240; DOT-4E240; DOT-39. 1,1-Difluoroethane (R–152a) (see note 8) ...... 79 ...... DOT-3A150; DOT-3AA150; DOT-3B150; DOT- 4B150; DOT-4BA225; DOT-4BW225; DOT- 3E1800; DOT-3AL150. 1,1-Difluoroethylene (R–1132A)...... 73 ...... DOT-3A2200; DOT-3AA2200; DOT-3AX2200; DOT-3AAX2200; DOT-3T2200; DOT-39. Dimethylamine, anhydrous ...... 59 ...... DOT-3A150; DOT-3AA150; DOT-3B150; DOT- 4B150; DOT-4BA225; DOT-4BW225; ICC– 3E1800. Ethane (see Note 8)...... 35.8 ...... DOT-3A1800; DOT-3AX1800; DOT-3AA1800; DOT-3AAX1800; DOT-3; DOT-3E1800; DOT- 3T1800; DOT-39; DOT-3AL1800. Ethane (see Note 8)...... 36.8 ...... DOT-3A2000; DOT-3AX2000; DOT-3AA2000; DOT-3AAX2000; DOT-3T2000; DOT-39; DOT- 3AL2000. Ethylene (see Note 8)...... 31.0 ...... DOT-3A1800; DOT-3AX1800; DOT-3AA1800; DOT-3AAX1800; DOT-3; DOT-3E1800; DOT- 3T1800; DOT-39; DOT-3AL1800. Ethylene (see Note 8)...... 32.5 ...... DOT-3A2000; DOT-3AX2000; DOT-3AA2000; DOT-3AAX2000; DOT-3T2000; DOT-39; DOT- 3AL2000. Ethylene (see Note 8)...... 35.5 ...... DOT-3A2400; DOT-3AX2400; DOT-3AA2400; DOT-3AAX2400; DOT-3T2400; DOT-39; DOT- 3AL2400. Hydrogen chloride, anhydrous ...... 65 ...... DOT-3A1800; DOT-3AA1800; DOT-3AX1800; DOT-3AAX1800; DOT-3; DOT-3T1800; DOT- 3E1800.

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Hydrogen sulfide (see Notes 10 and 14) ...... 62.5 ...... DOT-3A; DOT-3AA; DOT-3B; DOT-4A; DOT-4B; DOT-4BA; DOT-4BW; DOT-3E1800; DOT- 3AL. Insecticide, gases liquefied (see Notes 8 and 12) Not liquid full at 131 °F DOT-3A300; DOT-3AA300; DOT-3B300; DOT- 4B300; DOT-4BA300; DOT-4BW300; DOT- 3E1800. Liquefied nonflammable gases, other than classi- Not liquid full at 131 °F Specification packaging authorized in paragraph fied flammable, corrosive, toxic & mixtures or (a)(1) of this section and DOT-3HT; DOT 4D; solution thereof filled w/nitrogen, carbon dioxide, DOT-4DA; DOT-4DS. or air (see Notes 7 and 8).. Methyl acetylene-propadiene, mixtures, stabilized; Not liquid at 131 °F ...... DOT-4B240 without brazed seams; DOT- (see Note 5).. 4BA240 without brazed seams; DOT-3A240; DOT-3AA240; DOT-3B240; DOT-3E1800; DOT-4BW240; DOT-4E240; DOT-4B240ET; DOT-3AL240. Methyl chloride ...... 84 ...... DOT-3A225; DOT-3AA225; DOT-3B225; DOT- 4B225; DOT-4BA225; DOT-4BW225; DOT-3; DOT-3E1800; DOT-4B240ET. Cylinders com- plying with DOT-3A150; DOT-3B150; and DOT-4B150 manufactured prior to Dec. 7, 1936 are also authorized. Methyl mercaptan...... 80 ...... DOT-3A240; DOT-3AA240; DOT-3B240; OT- 4B240; DOT-4B240ET; DOT-3E1800; DOT- 4BA240; DOT-4BW240. Nitrosyl chloride ...... 110 ...... DOT-3BN400 only. Nitrous oxide (see Notes 7, 8, and 11) ...... 68 ...... DOT-3A1800; DOT-3AX1800; DOT-3AA1800; DOT-3AAX1800; DOT-3; DOT-3E1800; DOT- 3T1800; DOT-3HT2000; DOT-39; DOT- 3AL1800. Nitrous oxide, refrigerated liquid (see paragraph ...... DOT-4L. (e) of this section.). Refrigerant gas, n.o.s. or Dispersant gas, n.o.s. Not liquid full at 130 °F DOT-3A240; DOT-3AA240; DOT-3B240; DOT- (see Notes 8 and 13). 3E1800; DOT-4B240; DOT-4BA240; DOT- 4BW240; DOT-4E240; DOT-39; DOT-3AL240. Sulfur dioxide (see note 8) ...... 125 ...... DOT-3A225; DOT-3AA225; DOT-3B225; DOT- 4B225; DOT-4BA225; DOT-4BW225; DOT- 4B240ET; DOT-3; DOT-39; DOT-3E1800; DOT-3AL225. Sulfur hexafluoride ...... 120 ...... DOT-3A1000; DOT-3AA1000; DOT-AAX2400; DOT-3; DOT-3AL1000; DOT-3E1800; DOT- 3T1800. Sulfuryl fluoride ...... 106 ...... DOT-3A480; DOT-3AA480; DOT-3E1800; DOT- 4B480; DOT-4BA480; DOT-4BW480. Tetrafluoroethylene, stabilized ...... 90 ...... DOT-3A1200; DOT-3AA1200; DOT-3E1800. Trifluorochloroethylene, stabilized ...... 115 ...... DOT-3A300; DOT-3AA300; DOT-3B300; DOT- 4B300; DOT-4BA300; DOT-4BW300; DOT- 3E1800. Trimethylamine, anhydrous ...... 57 ...... DOT-3A150; DOT-3AA150; DOT-3B150; DOT- 4B150; DOT-4BA225; DOT-4BW225; DOT- 3E1800. Vinyl chloride (see Note 5)...... 84 ...... DOT-4B150 without brazed seams; DOT- 4BA225 without brazed seams; DOT-4BW225; DOT-3A150; DOT-3AA150; DOT-3E1800; DOT-3AL150. Vinyl fluoride, stabilized ...... 62 ...... DOT-3A1800; DOT-3AA1800; DOT-3E1800; DOT-3AL1800. Vinyl methyl ether, stabilized(see Note 5)...... 68 ...... DOT-4B150, without brazed seams; DOT- 4BA225 without brazed seams; DOT-4BW225; DOT-3A150; DOT-3AA150; DOT-3B1800; DOT-3E1800.

NOTE 1: ‘‘Filling density’’ means the percent ratio of the weight of gas in a packaging to the weight of water that the container will hold at 16 °C (60 °F). (1 lb of water=27.737 in 3 at 60 °F.). NOTE 2: Cylinders purchased after Oct. 1, 1944, for the transportation of chlorine must contain no aperture other than that provided in the neck of the cylinder for attachment of a valve equipped with an approved pressure relief device. Cylinders purchased after Nov. 1, 1935, and filled with chlorine may not contain over 68.04 kg (150 lb) of gas. NOTE 3: [Reserved]

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NOTE 4: Special carbon dioxide mining devices containing a heating element and filled with not over 2.72 kg (6 lb) of carbon dioxide may be filled to a density of not over 85 percent, provided the cylinder is made of steel with a calculated bursting pressure in excess of 39000 psig, fitted with a frangible disc that will operate at not over 57 percent of that pressure, and is able to withstand a drop of 10 feet when striking crosswise on a steel rail while under a pressure of at least 3000 psig. Such devices must be shipped in strong boxes or must be wrapped in heavy burlap and bound by 12-gauge wire with the wire completely cov- ered by friction tape. Wrapping must be applied so as not to interfere with the functioning of the frangible disc pressure relief device. Shipments must be described as ‘‘liquefied carbon dioxide gas (mining device)’’ and marked, labeled, and certified as prescribed for liquefied carbon dioxide. NOTE 5: All parts of valve and pressure relief devices in contact with contents of cylinders must be of a metal or other material, suitably treated if necessary, that will not cause formation of any acetylides. NOTE 6: [Reserved] NOTE 7: Specification 3HT cylinders for aircraft use only, having a maximum service life of 24 years. Authorized only for nonflammable gases. Cylinders must be equipped with pressure relief devices of the frangible disc type that meet the requirements of § 173.301(f). Each frangible disc must have a rated bursting pressure that does not exceed 90 percent of the minimum required test pressure of the cylinder. Discs with fusible metal backing are not permitted. Cylinders may be offered for transportation only when packaged in accordance with § 173.301(a)(9). NOTE 8: See § 173.301(a)(9). NOTE 9: [Reserved] NOTE 10: Each valve outlet must be sealed by a threaded cap or a threaded solid plug. NOTE 11: Must meet the valve and cleaning requirements in § 173.302(b). NOTE 12: For an insecticide gas that is nontoxic and nonflammable, see § 173.305(c). NOTE 13: For a refrigerant or dispersant gas that is nontoxic and nonflammable, see § 173.304(d). NOTE 14: The use of DOT specification cylinder with a marked service pressure of 480 psi is authorized until December 31, 2003.

(b) [Reserved] Minimum specific gravity of Maximum the filling density in (c) Verification of content in cylinder. ° percent of the water-weight liquid material at 60 F capacity of the cylinder Except as noted in paragraph (d)(4) of this section, the amount of liquefied 0.511 to 0.519 ...... 43 gas filled into a cylinder must be by 0.520 to 0.527 ...... 44 0.528 to 0.536 ...... 45 weight or, when the gas is lower in 0.537 to 0.544 ...... 46 pressure than required for liquefaction, 0.545 to 0.552 ...... 47 a pressure-temperature chart for the 0.553 to 0.560 ...... 48 specific gas may be used to ensure that 0.561 to 0.568 ...... 49 the service pressure at 55 °C (131 °F) 0.569 to 0.576 ...... 50 5 0.577 to 0.584 ...... 51 will not exceed ⁄4 of the service pres- 0.585 to 0.592 ...... 52 sure at 21 °C (70 °F). The weight of liq- 0.593 to 0.600 ...... 53 uefied gas filled into the cylinder also 0.601 to 0.608 ...... 54 must be checked, after disconnecting 0.609 to 0.617 ...... 55 the cylinder from the filling line, by 0.618 to 0.626 ...... 56 0.627 to 0.634 ...... 57 the use of an accurate scale. (d) Requirements for liquefied petro- (2) Subject to § 173.301a(d), any filling leum gas. (1) Filling density limits are density percentage prescribed in this as follows: section is authorized to be increased by a factor of 2 for liquefied petroleum gas Minimum specific gravity of Maximum the filling density in liquid material at 60 °F percent of the water-weight in DOT 3 cylinders or in DOT 3A cyl- capacity of the cylinder inders marked for 1800 psig, or higher, 0.271 to 0.289 ...... 26 service pressure. 0.290 to 0.306 ...... 27 (3) Liquefied petroleum gas must be 0.307 to 0.322 ...... 28 0.323 to 0.338 ...... 29 shipped in specification cylinders as 0.339 to 0.354 ...... 30 follows: 0.355 to 0.371 ...... 31 (i) DOT 3, 3A, 3AA, 3B, 3E, 3AL, 4B, 0.372 to 0.398 ...... 32 0.399 to 0.425 ...... 33 4BA, 4B240ET, 4BW, 4E, or 39 cylinders. 0.426 to 0.440 ...... 34 Shipments of flammable gases in DOT 0.441 to 0.452 ...... 35 3AL cylinders are authorized only 0.453 to 0.462 ...... 36 0.463 to 0.472 ...... 37 when transported by motor vehicle, 0.473 to 0.480 ...... 38 rail car, or cargo-only aircraft. 0.481 to 0.488 ...... 39 (ii) Additional containers may be 0.489 to 0.495 ...... 40 0.496 to 0.503 ...... 41 used within the limits of quantity and 0.504 to 0.510 ...... 42 pressure as follows:

Maximum capacity Maximum filling pressure Type of container (cubic (psig) inches)

DOT-2P or DOT-2Q (see Note 1) ...... 31.83 45 psig at 70 °F and 105 psig at 130 °F (see Note 2).

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Maximum capacity Maximum filling pressure Type of container (cubic (psig) inches)

DOT-2P or DOT-2Q (see Note 1) ...... 31.83 35 psig at 70 °F and 100 psig at 130 °F.

NOTE 1: Containers must be packed in strong wooden or fiber boxes of such design as to protect valves from damage or acci- dental functioning under conditions normally incident to transportation. Each completed container filled for shipment must have been heated until its contents reach a temperature of 54 °C (130 °F), without evidence of leakage, distortion, or other defect. Each outside shipping container must be plainly marked ‘‘INSIDE CONTAINERS COMPLY WITH PRESCRIBED SPECIFICA- TIONS’. NOTE 2: A container must be equipped with a pressure relief device that will prevent rupture of the container and dangerous projection of a closing device when exposed to fire.

(4) Verification of content. A cylinder tube after disconnecting from the fill- with a water capacity of 90.72 kg (200 ing line. The outlet from the dip tube lb) or more and for use with a liquefied may not be larger than 0.1016 centi- petroleum gas with a specific gravity meters (0.040 inch; No. 54 drill bit size of 0.504 or greater at 16 °C (60 °F) may orifice). A container representative of have the quantity of its contents deter- each day’s filling at each filling plant mined by using a fixed length dip tube must have its contents checked by gauging device. The length of the dip weighing after disconnecting from the tube must be such that when a lique- filling line. fied petroleum gas, with a specific vol- (e) Carbon dioxide, refrigerated liquid ume of 0.03051 cu. ft./lb. at a tempera- or nitrous oxide, refrigerated liquid. (1) ture of 40 °F, is filled into the con- The following provisions apply to car- tainer, the liquid just reaches the bot- bon dioxide, refrigerated liquid, and ni- tom of the tube. The weight of this liq- trous oxide, refrigerated liquid: uid may not exceed 42 percent of the (i) DOT 4L cylinders conforming to water capacity of the container, which the provisions of this paragraph are au- must be stamped on the cylinder. The thorized. length of the dip tube, expressed in (ii) Each cylinder must be protected inches carried out to one decimal place with at least one pressure relief device and prefixed with the letters ‘‘DT’’, and at least one frangible disc con- must be stamped on the container and forming to § 173.301(f) and paragraph on the exterior of removable type dip (a)(2) of this section. The relieving ca- tube. For the purpose of this require- pacity of the pressure relief device sys- ment, the marked length must be ex- tem must be equal to or greater than pressed as the distance measured along that calculated by the applicable for- the axis of a straight tube from the top mula in paragraph 5.8.3 of CGA S–1.1 of the boss through which the tube is (IBR, see § 171.7 of this subchapter). inserted to the proper level of the liq- (iii) The temperature and pressure of uid in the container. The length of the gas at the time the shipment is of- each dip tube must be checked when in- fered for transportation may not ex- stalled by weighing each container ceed ¥18 °C (0 °F) and 290 psig for car- after filling except when installed in bon dioxide and ¥15.6 °C (+4 °F) and 290 groups of substantially identical con- psig for nitrous oxide. Maximum time tainers, in which case one of each 25 in transit may not exceed 120 hours. containers must be weighed. The quan- (2) The following pressure relief de- tity of liquefied gas in each container vice settings, design service tempera- must be checked by means of the dip tures and filling densities apply:

Maximum permitted filling density Pressure relief device setting maximum start—to discharge gauge (percent by weight) pressure in psig Carbon dioxide, refrigerated Nitrous oxide, refrigerated liquid liquid

105 psig ...... 108 104 170 psig ...... 105 101 230 psig ...... 104 99 295 psig ...... 102 97 360 psig ...... 100 95 450 psig ...... 98 83 540 psig ...... 92 87

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625 psig ...... 86 80 Design service temperature °C (°F) ...... ¥196 °C (¥320 °F) ¥196 °C (¥320 °F)

[67 FR 51647, Aug. 8, 2002, as amended at 68 FR 24661, May 8, 2003; 68 FR 57632, Oct. 6, 2003; 68 FR 75742, Dec. 31, 2003; 70 FR 34076, June 13, 2005; 72 FR 4456, Jan. 31, 2007; 72 FR 55098, Sept. 28, 2007; 73 FR 4719, Jan. 28, 2008]

EDITORIAL NOTE: At 70 FR 34076, June 13, 2005, § 173.304a was amended in the table in paragraph (a)(2) by removing the phrase ‘‘DOT–4A480’’ from the entry ‘‘Hydrogen sulfide’’; how- ever, the amendment could not be incorporated because that phrase does not exist in the entry.

§ 173.304b Additional requirements for to or greater than the vapor pressure of shipment of liquefied compressed the liquid at 65 °C. gases in UN pressure receptacles. (3) For high pressure liquefied gases (a) General. Liquefied gases and gas or gas mixtures, the maximum filling mixtures must be offered for transpor- ratio may be determined using the for- tation in UN pressure receptacles sub- mulas in (3)(b) of P200 of the UN Rec- ommendations. ject to the requirements in this section (4) For low pressure liquefied gases or and § 173.304. In addition, the general gas mixtures, the maximum filling requirements applicable to UN pressure ratio may be determined using the for- receptacles in §§ 173.301 and 173.301b mulas in (3)(c) of P200 of the UN Rec- must be met. ommendations. (b) UN pressure receptacle filling limits. (c) Tetraflouroethylene, stabilized, A UN pressure receptacle is authorized UN1081 must be packaged in a pressure for the transportation of liquefied com- receptacle with a minimum test pres- pressed gases and gas mixtures as spec- sure of 200 bar and a working pressure ified in this section. When a liquefied not exceeding 5 bar. compressed gas or gas mixture is trans- (d) Fertilizer ammoniating solution ported in a UN pressure receptacle, the with free ammonia, UN1043 is not au- filling ratio may not exceed the max- thorized in UN tubes or MEGCs. imum filling ratio prescribed in this section and the applicable ISO stand- [74 FR 2265, Jan. 14, 2009] ard. Compliance with the filling limits § 173.305 Charging of cylinders with a may be determined by referencing the mixture of compressed gas and numerical values and data in Table 2 of other material. P200 of the UN Recommendations (IBR, (a) Detailed requirements. A mixture of see § 171.7 of this subchapter). Alter- a compressed gas and any other mate- natively, the maximum allowable fill- rial must be shipped as a compressed ing limits may be determined as fol- gas if the mixture is a compressed gas lows: as designated in § 173.115 and when not (1) For high pressure liquefied gases, in violation of § 173.301(a). in no case may the filling ratio of the (b) Filling limits. (See § 173.301.) For settled pressure at 65 °C (149 °F) exceed mixtures, the liquid portion of the liq- the test pressure of the UN pressure re- uefied compressed gas at 131 °F. plus ceptacle. any additional liquid or solid must not (2) For low pressure liquefied gases, completely fill the container. the filling factor (maximum mass of (c) Nonpoisonous and nonflammable contents per liter of water capacity) mixtures. Mixtures containing com- must be less than or equal to 95 percent pressed gas or gases including insecti- of the liquid phase at 50 °C. In addition, cides, which mixtures are nonpoisonous the UN pressure receptacle may not be and nonflammable under this part liquid full at 60 °C. The test pressure of must be shipped in cylinders as pre- the pressure receptacle must be equal scribed in § 173.304(a) or as follows:

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